The charger tag has no wiki summary.
1
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1answer
45 views
Building a small D cell battery charger?
I am looking to buy/build my own D cell Nimh battery charger with the following requirements:
-dual prong AC wall input
-charges Nimh D Cell
-is safe
-contained within 1" x 1.7" x 2.2" enclosure
As ...
0
votes
1answer
55 views
Charging 12V/4A battery
Can I charge a 12V/4Ah sealed rechargeable battery with a 13.5V/500mA charger? If so, how much time would I need to charge it to 100%? If not, how can I charge the battery?
1
vote
1answer
35 views
In circuit 2S Lithium Charging
I'm designing a board with a micro that controls a hobby servo. The circuit is usually powered from 12VDC but may be disconnected at any point, thus we have 2 lithium cells in series providing ~7.4V ...
0
votes
1answer
25 views
mobility scooter battery charger
I have a mobility scooter that I put a Raspberry Pi and Arduino on to make a robot. I left all the original electronics in place so I didn't have to buy a motor controller.
I was able to charge the ...
0
votes
0answers
49 views
Recycling a notebook battery pack
I've got an old battery pack ( from DELL ) to dismiss because batteries are gone. The battery contain an SMD board that I think being the charger module, and I would like to ask if that module can be ...
0
votes
1answer
57 views
Increasing the Voltage Output of a Solar Cell
I'm working on a project where I'm going to charge a battery using a solar cell. The cell is capable of outputting a maximum of 4 A, but only 0.5 volts (2W).
My question is, how can I charge the ...
-3
votes
0answers
32 views
What stores offer the best deals on Mobile Phone Chargers in the UK? [closed]
I am looking to buy several items and so googled for clearance sales going on for these:
Mobile Phone Chargers for 2 Samsung galaxy phones
desktop battery charger
plugtop adapter with dc connector
...
0
votes
1answer
57 views
How simulate trick htc wildfire charger (get max current)
I have an HTC wildfire phone and I'm looking for way to trick this HTC to think it's connected to the original charger. I don't have original so i can't open it to measure. Right now for charging I'm ...
-3
votes
1answer
81 views
How do I measure ripple current in a battery charger? [closed]
Minimizing ripple voltage is major factor to avoid failure of equipment such as digital axle counters. (Eldyne)
How do I measure ripple voltage in a battery charger with a 230 VAC input and a 24 VDC ...
1
vote
1answer
51 views
Lithium Ion charging problems - power outages
Does any one know if general charge circuits for lithium ion batteries suffer from this problem:
-Flat Battery put on to charge.
-A power outage of long duration occurs (say 8 hours).
-When power ...
1
vote
0answers
108 views
How to charge LiPo battery using a wind generator?
For a home robotics project I want to fly a kite using a computer. For this to happen I need an electro motor up in the air (attached to the kite) which obviously needs a battery up there as well. ...
0
votes
2answers
57 views
Why is this electro motor going slower?
From an old dust buster I've got this electro motor, the included battery pack and the charger:
I ripped everything apart (the dust buster was broken) and the motor still works. After playing ...
-1
votes
1answer
48 views
Smartphone Charging Specs [closed]
I am busy building my own smartphone charger and I need to know the charging requirements. I have read in a few articles that the average smartphone with a Lithium Ion battery requires a charging ...
0
votes
1answer
151 views
Charging phones via solar battery chargers
For a school project, I want to make a solar iPhone charger (specifically for the iPhone 4) and I've spent about a week looking up stuff all over the Internet, and I'm stuck for the hundredth time. ...
2
votes
2answers
153 views
Can I charge multiple devices from one transformer?
I am getting tired of bringing 3-4 power cables with me every time I travel and am thinking about building a multi-device power charger. In other words, this charger will have one transformer (and one ...
-3
votes
1answer
174 views
Schema for USB cable to charge old Nokia phone [closed]
I am looking to make a USB cable to charge my antique Nokia phone (Li-ion 3.7v 700mAh). I have searched and found a few articles but they have left me a little confused. The cable should work with a ...
-4
votes
4answers
502 views
Can a phone charger be adapted to charge a laptop battery? [closed]
I've obtained a laptop that has no charger. Short of buying another charger online, can a phone charger be adapted to charge the laptop's battery, provided it's disconnected from the laptop (i.e., the ...
4
votes
1answer
264 views
Converting and Stabilizing output voltage of a dynamo hub
Preface - I don't know much about electronics :P
I have ordered a Shimano dynamo hub for my bicycle. I have done a little homework and here are my findings about it:
The output of the above ...
-3
votes
1answer
127 views
How high charging temperature causes damage to AA size NiMH cell
I used a portable thermometer and put on top of a battery charger. I notice that the temperature reach 39 degree Celsius and I can feel the warmth when I put my hand on top of the charger & the ...
1
vote
2answers
152 views
Why using short traces with the MCP73831 LiPo charger?
I'd like to use an MCP73831 to charge my lipoly battery. In section 6.2 I see they recommend short wires to the battery.
I bought my battery with wires, 20 gauge and approximately 30cm long. The ...
0
votes
1answer
553 views
can I use a 5v 1a charger with a 5v 2a device? [duplicate]
Possible Duplicate:
Choosing power supply, how to get the voltage and current ratings?
I have a new tablet with a charger that reads 5v 2a, can I charge the tablet with my phone charger, ...
10
votes
3answers
625 views
Cellphone charger has no transformer?
I opened up a really tiny mobile phone charger I have, to see how it is designed. The entire "charger" is integrated into a small 2-pin mains plug, 1 x 1.25 x 0.5 inch, that has an USB socket for the ...
1
vote
1answer
75 views
How do I calculate the power output of a 12 unit trickle charger for mobile phones? [closed]
I'm trying to do some analysis on the power consumption of mobile phones, charged through a trickle charging unit. My scenario is as follows:
12x smartphones on a smartphone bay (wall).
1x Mains ...
1
vote
2answers
337 views
Arduino shows voltage drop, voltmeter doesn't
I'm totally lost with the behavior of this simple schematics.
Once the charging process starts, Arduino's voltage reading becomes very different (should I say wrong) from the one voltmeter shows, as ...
0
votes
1answer
71 views
Phone charger reading no amperage?
I've got an old Sony Ericsson with a charger that's sustained some damage. The cord has been melted and flattened in one place. Neither the charger nor phone has been used in a long time. The battery ...
1
vote
1answer
77 views
Is it safe to use the cable used in Portable Battery Charger and connect to the phone via the PC USB?
Every portable battery charger have a cable. That cable is usually connecting the PC USB port to the Portable Battery Charger so as to charge the battery inside the Portable Battery Charger.
So, is ...
2
votes
1answer
268 views
How to determine the total number of charges a portable charger can supply for a phone?
According to can a 3000mAh portable charger charge a 1500mAh battery?, it was mentioned that a 3000mAh Portable charger can only charge a 1500mAh phone's battery 1.33334 times.
So, how do we ...
6
votes
3answers
276 views
Name of this component
What is the name of this component (circled in red) of a charger?
What are the uses of this component?
-2
votes
2answers
2k views
4 colored wires in a cellphone charger [closed]
I'm trying to recycle an old cell phone charger to power something else. I've cut the tip off and I see 4 wires... with following colors: red, green, blue, and yellow. I can't figure out which ones ...
1
vote
1answer
210 views
Risk of overloading a usb charger
I just bought this product: "Jackson PT1USB" as an attemp to get a portable charger for my netbook, ipad 2 and smartphone.
Now I am bit worried after reading in the product "total connected load to ...
1
vote
3answers
2k views
Is it possible to make a usb charger to power multiple devices?
I was thinking how nice it would be to have a single wall plug with multiple (4-6) USB ports that would be capable of supplying enough power (at 5v) to charge say an iPad, smartphone, bluetooth ...
18
votes
2answers
478 views
Solution for adapting to USB current draw limits?
Summary: I'm setting up a USB-powered Li-ion charging circuit and would of course like to draw the maximum charge current possible situationally -- but also want to ensure I don't violate the USB ...
3
votes
0answers
288 views
Parallel charge a serial pack, LiFePO4
I have an idea that I am trying to explore. I use 48V headway cell packs to power my various electric bicycle projects. Trying to balance charge a 16s pack can be a problem. I had the idea of using ...
6
votes
2answers
744 views
Critique of my Data logger's Power circuit design
I am laying out my first full device, a fairly simple sensor-data logger, with these specs in mind:
I'm running microcontroller and sensor @ 3.3V, with load varying from 10 mA to 400 mA
device will ...
0
votes
0answers
170 views
making USB charger but it isn't pushing enough power to the USB ports
I am in the military and trying to use BA-5590s the radio batteries as a power source but when plugged in it isn't pushing enough power. I am thinking of switching the resistors they were 12V chargers ...
0
votes
3answers
959 views
Protecting diode bridge from higher current
I have designed a battery charger circuit. The circuit is simple AC to DC power supply circuit, it is composed of a 220 Volt to 16 Volt stepdown transformer, a diode bridge and a capacitor.
Now the ...
5
votes
4answers
944 views
When using a Laptop, is it desirable to keep it charged from the Mains all the time?
While using laptop I usually plug in my Laptop charger (i.e., from Mains power).
What is more effective - to keep Laptop plugged in at all times when possible, or some other approach (e.g., running ...
3
votes
1answer
487 views
USB to 3-cell Lipo charger?
I have a data-logger project that needs to run from a 3-cell Lithium Polymer battery. It has 5v and 3.3v regulators to provide regulated power to the system.
I want to build the battery into the ...
1
vote
4answers
963 views
DIY NiCad charger
I have this Ryobi 12V NiCad cordless drill that was sitting in a drawer for the past 6 years or so due to dead batteries (2 of them). At least that's what I tought at the time but looking at it more ...
2
votes
1answer
374 views
Li-Po USB Charger with PIC, voltage is not falling to 0V
I am designing a single cell Li-Po charger with a PIC. I have this:
I drive the transistors from a 12F PIC microcontroller. As you can see in the square wave on the top of the oscilloscope the ...
3
votes
2answers
216 views
Solar MPPT charger causing regular voltage spikes
I have a van which has two 12V solar panels on the roof. The charger is connected to the batteries and seems to constantly be outputting about 13v. I've had it installed for a couple of days and ...
-1
votes
2answers
124 views
How do I tell if a charger works with/potentially breaks a device? [duplicate]
Possible Duplicate:
Choosing power supply, how to get the voltage and current ratings?
This should be generally applicable, but in my case it concerns laptops. I have two laptops of similar ...
1
vote
1answer
1k views
What is the pinout for HTC One X docks?
I used to have a Motorola Milestone which used magnets to detect car and desktop docks.
I've now got an HTC One X and am looking for dock options. The standard ones look pretty expensive, but there ...
3
votes
1answer
1k views
Smart charging circuit for NiMH battery pack
I want to build a solar powered charger for a niMh battery pack to run a microcontroller. What are the fundamentals of building a smart circuit that will not overcharge the battery and will also allow ...
-2
votes
1answer
435 views
Can I use my Android tablet charger for the PlayBook? [closed]
I got a BlackBerry PlayBook and it came with the wrong charger plug. It's for the US that I can't use here in Germany.
Can I use my Android tablet charger for the PlayBook instead?
The information ...
2
votes
1answer
197 views
Value of blown resistor in this simple lead acid charger, Please help if you can
I hope someone can help with this very simple circuit, I have traced from the pcb, my electronics theory has really gone out the window, The circuit shown is from a car battery charger and has a 2 ...
-2
votes
2answers
268 views
5V and +5v charger adapter, What is the difference? [closed]
I am trying to buy a stand-alone charger for my Archos 48 500Gb Internet media player. I think it uses a charger which is Output 5V 2A, but I recently came across a ...
0
votes
2answers
791 views
12V -> 5V 1A using L7805CV
I need to convert 12V (may vary from 11 to 14V - motorbike battery) to 5V 1A (microusb phone charger). I have the L7805CV positive voltage regulator.
Which capacitors I need to connect at input and ...
2
votes
2answers
3k views
Building a USB charger for camping
I was looking into building a battery powered USB charger for camping. It occurred to me that car chargers are pre-built and run off 12 V. If I made a battery pack out of 8x 1.5 V batteries in series ...
2
votes
3answers
356 views
Why doesn't my solar charger work?
I did exactly as that picture showed, and I guess how it works is that it charges the AA batteries and then takes energy from them to charge something through the USB hole? Right? (I'm new to ...
